Blade materials and processing technology of wind turbines

Time:2023-02-23   Visits:1147

In 1925, the Jacobs wind turbine production plant in the United States invented a three blade propeller impeller, which greatly improved the power and performance of the horizontal axis impeller. The components of a wind turbine are primarily the blades. The wind wheel of a wind turbine is generally composed of 2-3 blades. Small wind turbines have more than three impellers. Large wind turbines with a capacity of over 1.5MW are mostly of the 3-blade type. Why do we have to use a three blade generator? A professional perspective requires consideration of aerodynamics, which is clearly not suitable for further discussion. From a common sense perspective, the larger the windward force surface of the blade, the greater the effective effect of wind propulsion. But due to the vortex generated during blade rotation, there will be a vortex system during blade rotation. The conventional eddy current system of the impeller has a conversion rate of only 25% to 45% for the blades to receive wind energy. Therefore, considering the power of the blades comprehensively, making them larger, longer, lighter, and more flexible is the central direction for blade development.

1. The evolution of leaf data is mainly towards large-scale and lightweight development with the continuous increase of leaf scale, gradually transitioning from initial wood products to fiberglass, and now using carbon fiber composite materials (CFRP). With the continuous breaking of carbon fiber and epoxy resin composite materials. At present, the primary choice for wind turbine blades is carbon fiber materials. Some ultra long blades will use steel as the primary load-bearing component at the junction. Siemens Gomesa has developed segmented blades, and steel is also used at the connection between the two sections of the blades.

2. The manufacturing process of carbon fiber blades mainly includes hand lay-up molding, molding, prepreg molding, pultrusion molding, fiber wrapping, resin transfer molding, and vacuum injection molding. In short, the use of composite data has become inevitable in the lightweight and large-scale, high flexibility development of wind turbine blades. Carbon fiber composite materials can be lightweight, withstand large tensile forces together, and more importantly, have a longer service life.